My arduino Uno was working normally. I ran the program succeed but Suddenly it has an error "skt500_recv() : programmer is not responding
stk500_getsync() attemp 1 of 10: not in sync: resp=0xc9"
I tried to plug out all the wire and pushed the reset button, I checked COM port and update driver, download older driver but still cant handle it 
Could somebody help me please!!! Thank you guy very much!!!
Could be that you broke your Arduino.
Hard to tell.
Try another.